American-standard Freedom 80 User Manual download pdf (Page 19)

12-1263-02 19

Twinning

Field Wiring

TWIN

TWIN

TWINNING CONNECTION DIAGRAM

FOR TWINNING UD/DD-R FURNACES

1 STAGE HEAT / 1 STAGE COOLING THERMOSTAT

1 STAGE

HEATING / COOLING

THERMOSTAT FURNACE NO. 1

FURNACE NO. 2

BLOWER OPERATION OF

UNIT NO. 2 IS SYNCRONIZED

WITH UNIT NO. 1 VIA SIGNALS

FROM TWIN CONNECTION.

SEE NOTE 4

OUTDOOR UNIT NO. 1

(NO TRANSFORMER)

OUTDOOR UNIT NO. 1

(WITH TRANSFORMER)

SEE NOTE 3

RC

ISOLATION RELAY

(FIELD SUPPLIED)

ALTERNATE CONNECTION

R1

R1

SEE NOTE 5

ISOLATION RELAY

(FIELD SUPPLIED)

SEE NOTE 4

JUMPER W1 TO W2

ON BOTH UNITS.

2ND STAGE WILL FIRE

10 MINUTES AFTER 1ST.

B/C

B/C

B/C

From Dwg. 21B341487 Rev. 1

TWIN

TWIN

TWINNING CONNECTION DIAGRAM

FOR TWINNING UD/DD-R FURNACES

2 STAGE HEAT / 1 STAGE COOLING THERMOSTAT

2 STAGE HEATING

1 STAGE COOLING

THERMOSTAT FURNACE NO. 1

FURNACE NO. 2

BLOWER OPERATION OF

UNIT NO. 2 IS SYNCRONIZED

WITH UNIT NO. 1 VIA SIGNALS

FROM TWIN CONNECTION.

SEE NOTE 4

OUTDOOR UNIT NO. 1

(NO TRANSFORMER)

OUTDOOR UNIT NO. 1

(WITH TRANSFORMER)

SEE NOTE 3

RC

ISOLATION RELAY

(FIELD SUPPLIED)

ALTERNATE CONNECTION

R2

R2

SEE NOTE 5

ISOLATION RELAY

(FIELD SUPPLIED)

SEE NOTE 4

ISOLATION RELAY

SEE NOTE 4

R1

R1

B/C

B/C

B/C

From Dwg. 21B341488 Rev. 1

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